4 Prefer standard datatypes

LDPR representations must use only the following standard datatypes. RDF does not by itself define datatypes to be used for literal property values, therefore a set of standard datatypes based on [XMLSCHEMA11-2] and [RDF-PRIMER] are to be used:

6 Properly use q values

Not properly handling q values is a major problem in implementations of content negotiation.

7 Use canonical URIs for identity comparison

Location and/or Content-Location header contains canonical URI

Clients should use canonical URI when comparing resources for "same-ness" (identity), even if the resources are accessed via distinct URLs.

Most common case is URLs that vary by protocol, one HTTP and one HTTPS, but are otherwise identical. In most cases those two URLs refer to the same resource, and the server should respond to requests to either URL with a single (canonical) URL.